Self-oriented Ca3Co4 O9 thin film as an anode material for enhanced cycling stability of lithium-ion batteries

Abstract

Self-oriented Ca3Co4O9 nanoflake thin film has been prepared by a simple sol-gel method as the anode for thin-film lithium-ion batteries. The X-ray diffraction and transmission electron microscopy results show that the prepared Ca3 Co4 O 9 /Pt film is c -axis self-oriented and composed of nanoflakes approximately 2 μm in diameter and 200-300 nm thick. The reversible lithium storage capacity of the Ca3 Co4 O9 thin-film electrode at 1 C is around 800 mAh g-1, and it retains more than 70% capacity after 50 cycles, suggesting that the Ca3 Co4O9 thin film can be used as the anode for lithium-ion batteries. © 2009 The Electrochemical Society.